This is a preview - click here to buy the full publication
®
INTERNATIONAL
STANDARD
IEC 60981
Edition 3.0 2019-08
REDLINE VERSION
colour
inside
Extra heavy-duty electrical rigid steel conduits
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 29.120.10
ISBN 978-2-8322-7331-9
Warning! Make sure that you obtained this publication from an authorized distributor.
® Registered trademark of the International Electrotechnical Commission
This is a preview - click here to buy the full publication
–2–
IEC 60981:2019 RLV © IEC 2019
CONTENTS
FOREWORD ........................................................................................................................... 4
1
Scope .............................................................................................................................. 6
2
Normative references ...................................................................................................... 6
3
Terms and definitions ...................................................................................................... 6
4
General requirements ...................................................................................................... 8
4.1
4.2
4.3
4.4
4.4.1
4.4.2
4.5
4.6
4.7
4.7.1
4.7.2
5
Tests ...................................................................................................................... 8
Circular cross-section ............................................................................................. 8
Wall thickness ......................................................................................................... 8
Surface condition .................................................................................................... 8
General ........................................................................................................... 8
Localized surface imperfections ....................................................................... 8
Welding .................................................................................................................. 8
Cleaning ................................................................................................................. 8
Protective coating(s) ............................................................................................... 8
Primary coating(s) ........................................................................................... 8
Secondary coating(s) ....................................................................................... 9
Alternative coatings ...........................................................................................
Dimensions...................................................................................................................... 9
5.1
Dimensions ............................................................................................................. 9
5.2
Threads .................................................................................................................. 9
5.2.1
General ........................................................................................................... 9
5.2.2
Pitch form ........................................................................................................ 9
5.2.3
Angle of thread ................................................................................................ 9
6
Protective coatings .......................................................................................................... 9
6.1
Interior coatings ...................................................................................................... 9
6.1.1
Zinc ................................................................................................................. 9
6.1.2
Organic coatings.............................................................................................. 9
6.2
Exterior coatings ................................................................................................... 10
6.2.1
Zinc coating ................................................................................................... 10
6.2.2
Alternative corrosion-resistant coating ........................................................... 11
7
Threading and chamfering ............................................................................................. 14
8
Couplings ...................................................................................................................... 14
8.1
General ................................................................................................................. 14
8.1.1
Corrosion protection ...................................................................................... 14
8.1.2
Chamfering .................................................................................................... 14
8.1.3
Dimensions .................................................................................................... 14
8.2
Coupling threads ................................................................................................... 14
8.2.1
Thread form ................................................................................................... 14
8.2.2
Dimensions .................................................................................................... 14
9
Elbows and nipples ........................................................................................................ 14
10
Ductility ......................................................................................................................... 15
10.1 Bending properties ................................................................................................ 15
10.2 Ductility of zinc coating ......................................................................................... 15
11 Marking ......................................................................................................................... 15
11.1
General ................................................................................................................. 15
This is a preview - click here to buy the full publication
IEC 60981:2019 RLV © IEC 2019
–3–
11.2 Required information ............................................................................................. 15
Annex A (normative) Test for thickness of zinc coating on extra heavy-duty electrical
rigid steel (EHDERS) conduits .............................................................................................. 24
A.1
Requirement ......................................................................................................... 24
A.2
Solutions required ................................................................................................. 24
A.3
Preparation of samples ......................................................................................... 24
A.4
Specimen surface condition .................................................................................. 24
A.5
Test method .......................................................................................................... 24
A.6
Results ................................................................................................................. 25
Annex B (normative) Tests for evaluating alternative exterior coatings applied on extra
heavy-duty electrical rigid steel (EHDERS) conduits ............................................................. 26
B.1
Alternative corrosion-resistant coatings ................................................................. 26
B.2
Preparation of specimens ..................................................................................... 26
B.3
Air oven conditioning exposure ............................................................................. 28
B.4
Resistance to ultraviolet light and water exposure ................................................. 29
B.5
Resistance to salt spray (fog) exposure ................................................................ 29
B.6
Resistance to moist carbon dioxide-sulfur dioxide-air exposure ............................. 29
Bibliography .......................................................................................................................... 30
Figure 1 – Dimensions of threads for EHDERS conduits ....................................................... 18
Figure 2 – Basic form of taper thread .................................................................................... 19
Figure 3 – Limits on crest and root truncation of external and internal threads ...................... 20
Figure 4 – Dimensions of a ferrous metal coupling ................................................................ 21
Figure 5 – Dimensions of wedge ........................................................................................... 22
Figure 6 – Essential dimensions for flame test ...................................................................... 23
Figure B.1 – Alternative corrosion program flowchart with sample requirements ................... 27
Figure B.2 – Scribe pattern ................................................................................................... 28
Table 1 – Dimensions and mass of EHDERS conduits .......................................................... 16
Table 2 – Dimensions of couplings ........................................................................................ 17
Table 3 – Dimensions of 90° elbows ..................................................................................... 17
This is a preview - click here to buy the full publication
–4–
IEC 60981:2019 RLV © IEC 2019
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
EXTRA HEAVY-DUTY ELECTRICAL RIGID STEEL CONDUITS
FOREWORD
1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
all national electrotechnical committees (IEC National Committees). The object of IEC is to promote
international co-operation on all questions concerning standardization in the electrical and electronic fields. To
this end and in addition to other activities, IEC publishes International Standards, Technical Specifications,
Technical Reports, Publicly Available Specifications (PAS) and Guides (hereafter referred to as "IEC
Publication(s)"). Their preparation is entrusted to technical committees; any IEC National Committee interested
in the subject dealt with may participate in this preparatory work. International, governmental and nongovernmental organizations liaising with the IEC also participate in this preparation. IEC collaborates closely
with the International Organization for Standardization (ISO) in accordance with conditions determined by
agreement between the two organizations.
2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international
consensus of opinion on the relevant subjects since each technical committee has representation from all
interested IEC National Committees.
3) IEC Publications have the form of recommendations for international use and are accepted by IEC National
Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC
Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any
misinterpretation by any end user.
4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications
transparently to the maximum extent possible in their national and regional publications. Any divergence
between any IEC Publication and the corresponding national or regional publication shall be clearly indicated in
the latter.
5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity
assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any
services carried out by independent certification bodies.
6) All users should ensure that they have the latest edition of this publication.
7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and
members of its technical committees and IEC National Committees for any personal injury, property damage or
other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and
expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC
Publications.
8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
indispensable for the correct application of this publication.
9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of
patent rights. IEC shall not be held responsible for identifying any or all such patent rights.
This redline version of the official IEC Standard allows the user to identify the changes
made to the previous edition. A vertical bar appears in the margin wherever a change
has been made. Additions are in green text, deletions are in strikethrough red text.
This is a preview - click here to buy the full publication
IEC 60981:2019 RLV © IEC 2019
–5–
International Standard IEC 60981 has been prepared by subcommittee 23A:
management systems, of IEC technical committee 23: Electrical accessories.
Cable
This third edition cancels and replaces the second edition published in 2004. This edition
constitutes a technical revision.
This edition includes the following significant technical changes with respect to the second
edition:
a) addition of provisions for alternative coatings to zinc;
b) addition of elasticity test for organic coatings;
c) new Annex B on tests for evaluating alternative exterior coatings applied on extra
heavy­duty electrical rigid steel (EHDERS) conduits.
The text of this International Standard is based on the following documents:
FDIS
Report on voting
23A/886/FDIS
23A/888/RVD
Full information on the voting for the approval of this International Standard can be found in
the report on voting indicated in the above table.
This document has been drafted in accordance with the ISO/IEC Directives, Part 2.
In this document, the following print types are used:
•
requirements proper: in roman type;
•
test specifications: in italic type;
•
explanatory matter: in smaller roman type.
The committee has decided that the contents of this document will remain unchanged until the
stability date indicated on the IEC website under "http://webstore.iec.ch" in the data related to
the specific document. At this date, the document will be
•
reconfirmed,
•
withdrawn,
•
replaced by a revised edition, or
•
amended.
IMPORTANT – The 'colour inside' logo on the cover page of this publication indicates
that it contains colours which are considered to be useful for the correct
understanding of its contents. Users should therefore print this document using a
colour printer.
This is a preview - click here to buy the full publication
–6–
IEC 60981:2019 RLV © IEC 2019
EXTRA HEAVY-DUTY ELECTRICAL RIGID STEEL CONDUITS
1
Scope
This document specifies requirements for extra heavy-duty electrical rigid steel (EHDERS)
conduits, couplings, nipples and elbows for electrical installations, including communications
and fibre optics. This document also specifies threads for these components.
It is not applicable to the conduits specified in IEC 60423 1) .
2
Normative references
The following documents are referred to in the text in such a way that some or all of their
content constitutes requirements of this document. For dated references, only the edition
cited applies. For undated references, the latest edition of the referenced document (including
any amendments) applies.
IEC 60695-11-3, Fire hazard testing – Part 11-3: Test flames – 500 W flames – Apparatus and
confirmational test methods
IEC 61950, Cable management systems – Specifications for conduit fittings and accessories
for electrical cable installations for extra heavy duty metal electrical steel conduit
ISO 527 (all parts), Plastics – Determination of tensile properties
ISO 4892-2, Plastics – Methods of exposure to laboratory light sources – Part 2: Xenon-arc
lamps
ISO 9227, Corrosion tests in artificial atmospheres – Salt spray tests
ISO 13263, Thermoplastics piping systems for non-pressure underground drainage and
sewerage – Thermoplastics fittings – Test method for impact strength
ISO 19095-3, Plastics – Evaluation of the adhesion interface performance in plastic-metal
assemblies – Part 3: Test methods
3
Terms and definitions
For the purposes of this document, the following terms and definitions apply.
ISO and IEC maintain terminological databases for use in standardization at the following
addresses:
•
IEC Electropedia: available at http://www.electropedia.org/
•
ISO Online browsing platform: available at http://www.iso.org/obp
___________
1) IEC 60423, Conduits for electrical purposes – Outside diameters of conduits for electrical installations and
threads for conduits and fittings
This is a preview - click here to buy the full publication
®
IEC 60981
Edition 3.0 2019-08
INTERNATIONAL
STANDARD
colour
inside
IEC 60981:2019-08(en)
Extra heavy-duty electrical rigid steel conduits
This is a preview - click here to buy the full publication
–2–
IEC 60981:2019 © IEC 2019
CONTENTS
FOREWORD ........................................................................................................................... 4
1
Scope .............................................................................................................................. 6
2
Normative references ...................................................................................................... 6
3
Terms and definitions ...................................................................................................... 6
4
General requirements ...................................................................................................... 8
4.1
Tests ...................................................................................................................... 8
4.2
Circular cross-section ............................................................................................. 8
4.3
Wall thickness ......................................................................................................... 8
4.4
Surface condition .................................................................................................... 8
4.4.1
General ........................................................................................................... 8
4.4.2
Localized surface imperfections ....................................................................... 8
4.5
Welding .................................................................................................................. 8
4.6
Cleaning ................................................................................................................. 8
4.7
Protective coating(s) ............................................................................................... 8
4.7.1
Primary coating(s) ........................................................................................... 8
4.7.2
Secondary coating(s) ....................................................................................... 9
5
Dimensions...................................................................................................................... 9
5.1
Dimensions ............................................................................................................. 9
5.2
Threads .................................................................................................................. 9
5.2.1
General ........................................................................................................... 9
5.2.2
Pitch form ........................................................................................................ 9
5.2.3
Angle of thread ................................................................................................ 9
6
Protective coatings .......................................................................................................... 9
6.1
Interior coatings ...................................................................................................... 9
6.1.1
Zinc ................................................................................................................. 9
6.1.2
Organic coatings.............................................................................................. 9
6.2
Exterior coatings ................................................................................................... 10
6.2.1
Zinc ............................................................................................................... 10
6.2.2
Alternative corrosion-resistant coating ........................................................... 10
7
Threading and chamfering ............................................................................................. 13
8
Couplings ...................................................................................................................... 14
8.1
General ................................................................................................................. 14
8.1.1
Corrosion protection ...................................................................................... 14
8.1.2
Chamfering .................................................................................................... 14
8.1.3
Dimensions .................................................................................................... 14
8.2
Coupling threads ................................................................................................... 14
8.2.1
Thread form ................................................................................................... 14
8.2.2
Dimensions .................................................................................................... 14
9
Elbows and nipples ........................................................................................................ 14
10
Ductility ......................................................................................................................... 14
10.1 Bending properties ................................................................................................ 14
10.2 Ductility of zinc coating ......................................................................................... 14
11 Marking ......................................................................................................................... 15
11.1
11.2
General ................................................................................................................. 15
Required information ............................................................................................. 15
This is a preview - click here to buy the full publication
IEC 60981:2019 © IEC 2019
–3–
Annex A (normative) Test for thickness of zinc coating on extra heavy-duty electrical
rigid steel (EHDERS) conduits .............................................................................................. 24
A.1
Requirement ......................................................................................................... 24
A.2
Solutions required ................................................................................................. 24
A.3
Preparation of samples ......................................................................................... 24
A.4
Specimen surface condition .................................................................................. 24
A.5
Test method .......................................................................................................... 24
A.6
Results ................................................................................................................. 25
Annex B (normative) Tests for evaluating alternative exterior coatings applied on extra
heavy-duty electrical rigid steel (EHDERS) conduits ............................................................. 26
B.1
Alternative corrosion-resistant coatings ................................................................. 26
B.2
Preparation of specimens ..................................................................................... 26
B.3
Air oven conditioning exposure ............................................................................. 28
B.4
Resistance to ultraviolet light and water exposure ................................................. 29
B.5
Resistance to salt spray (fog) exposure ................................................................ 29
B.6
Resistance to moist carbon dioxide-sulfur dioxide-air exposure ............................. 29
Bibliography .......................................................................................................................... 30
Figure 1 – Dimensions of threads for EHDERS conduits ....................................................... 18
Figure 2 – Basic form of taper thread .................................................................................... 19
Figure 3 – Limits on crest and root truncation of external and internal threads ...................... 20
Figure 4 – Dimensions of a ferrous metal coupling ................................................................ 21
Figure 5 – Dimensions of wedge ........................................................................................... 22
Figure 6 – Essential dimensions for flame test ...................................................................... 23
Figure B.1 – Alternative corrosion program flowchart with sample requirements ................... 27
Figure B.2 – Scribe pattern ................................................................................................... 28
Table 1 – Dimensions and mass of EHDERS conduits .......................................................... 16
Table 2 – Dimensions of couplings ........................................................................................ 17
Table 3 – Dimensions of 90° elbows ..................................................................................... 17
This is a preview - click here to buy the full publication
–4–
IEC 60981:2019 © IEC 2019
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
EXTRA HEAVY-DUTY ELECTRICAL RIGID STEEL CONDUITS
FOREWORD
1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
all national electrotechnical committees (IEC National Committees). The object of IEC is to promote
international co-operation on all questions concerning standardization in the electrical and electronic fields. To
this end and in addition to other activities, IEC publishes International Standards, Technical Specifications,
Technical Reports, Publicly Available Specifications (PAS) and Guides (hereafter referred to as "IEC
Publication(s)"). Their preparation is entrusted to technical committees; any IEC National Committee interested
in the subject dealt with may participate in this preparatory work. International, governmental and nongovernmental organizations liaising with the IEC also participate in this preparation. IEC collaborates closely
with the International Organization for Standardization (ISO) in accordance with conditions determined by
agreement between the two organizations.
2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international
consensus of opinion on the relevant subjects since each technical committee has representation from all
interested IEC National Committees.
3) IEC Publications have the form of recommendations for international use and are accepted by IEC National
Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC
Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any
misinterpretation by any end user.
4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications
transparently to the maximum extent possible in their national and regional publications. Any divergence
between any IEC Publication and the corresponding national or regional publication shall be clearly indicated in
the latter.
5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity
assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any
services carried out by independent certification bodies.
6) All users should ensure that they have the latest edition of this publication.
7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and
members of its technical committees and IEC National Committees for any personal injury, property damage or
other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and
expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC
Publications.
8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
indispensable for the correct application of this publication.
9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of
patent rights. IEC shall not be held responsible for identifying any or all such patent rights.
International Standard IEC 60981 has been prepared by subcommittee 23A:
management systems, of IEC technical committee 23: Electrical accessories.
Cable
This third edition cancels and replaces the second edition published in 2004. This edition
constitutes a technical revision.
This edition includes the following significant technical changes with respect to the second
edition:
a) addition of provisions for alternative coatings to zinc;
b) addition of elasticity test for organic coatings;
c) new Annex B on tests for evaluating alternative exterior coatings applied on extra
heavy­duty electrical rigid steel (EHDERS) conduits.
This is a preview - click here to buy the full publication
IEC 60981:2019 © IEC 2019
–5–
The text of this International Standard is based on the following documents:
FDIS
Report on voting
23A/886/FDIS
23A/888/RVD
Full information on the voting for the approval of this International Standard can be found in
the report on voting indicated in the above table.
This document has been drafted in accordance with the ISO/IEC Directives, Part 2.
In this document, the following print types are used:
•
requirements proper: in roman type;
•
test specifications: in italic type;
•
explanatory matter: in smaller roman type.
The committee has decided that the contents of this document will remain unchanged until the
stability date indicated on the IEC website under "http://webstore.iec.ch" in the data related to
the specific document. At this date, the document will be
•
reconfirmed,
•
withdrawn,
•
replaced by a revised edition, or
•
amended.
A bilingual version of this publication may be issued at a later date.
IMPORTANT – The 'colour inside' logo on the cover page of this publication indicates
that it contains colours which are considered to be useful for the correct
understanding of its contents. Users should therefore print this document using a
colour printer.
This is a preview - click here to buy the full publication
–6–
IEC 60981:2019 © IEC 2019
EXTRA HEAVY-DUTY ELECTRICAL RIGID STEEL CONDUITS
1
Scope
This document specifies requirements for extra heavy-duty electrical rigid steel (EHDERS)
conduits, couplings, nipples and elbows for electrical installations, including communications
and fibre optics. This document also specifies threads for these components.
It is not applicable to the conduits specified in IEC 60423.
2
Normative references
The following documents are referred to in the text in such a way that some or all of their
content constitutes requirements of this document. For dated references, only the edition
cited applies. For undated references, the latest edition of the referenced document (including
any amendments) applies.
IEC 60695-11-3, Fire hazard testing – Part 11-3: Test flames – 500 W flames – Apparatus and
confirmational test methods
IEC 61950, Cable management systems – Specifications for conduit fittings and accessories
for cable installations for extra heavy duty electrical steel conduit
ISO 527 (all parts), Plastics – Determination of tensile properties
ISO 4892-2, Plastics – Methods of exposure to laboratory light sources – Part 2: Xenon-arc
lamps
ISO 9227, Corrosion tests in artificial atmospheres – Salt spray tests
ISO 13263, Thermoplastics piping systems for non-pressure underground drainage and
sewerage – Thermoplastics fittings – Test method for impact strength
ISO 19095-3, Plastics – Evaluation of the adhesion interface performance in plastic-metal
assemblies – Part 3: Test methods
3
Terms and definitions
For the purposes of this document, the following terms and definitions apply.
ISO and IEC maintain terminological databases for use in standardization at the following
addresses:
•
IEC Electropedia: available at http://www.electropedia.org/
•
ISO Online browsing platform: available at http://www.iso.org/obp